When trying to auto assign Owner for assets if it shows failed for all assets with screen shot like shown below,
As you can see from the above screen shot that the Suggested Owner field is Empty for all assets.
In such cases, you can observe the below traces in logs,
Auto Assign retain the assets as it is : true|
[09:08:58:629]|[10-22-2019]|[com.adventnet.servicedesk.asset.util.AssetUtil]|[INFO]|[120]: handleOwnerChange >>> resourceId:[Ljava.lang.Long;@3f25eb53 user: department:null assetSite:7|
[09:08:58:629]|[10-22-2019]|[SYSERR]|[INFO]|[120]: java.lang.NumberFormatException: For input string: ""|
[09:08:58:629]|[10-22-2019]|[SYSERR]|[INFO]|[120]: at java.lang.NumberFormatException.forInputString(Unknown Source)|
[09:08:58:629]|[10-22-2019]|[SYSERR]|[INFO]|[120]: at java.lang.Long.parseLong(Unknown Source)|
Make sure to check if the suggested owner is listed to resolve the issue.